According to your description, I suggest you refer to the following information:
System installation is divided into three situations.
If 100MB system boot partition is created on HDD, the system is installed on SSD and can be started and used normally.
If the 100MB system boot partition and the system are installed on the SSD with mSATA interface, the SSD will not boot when the HDD is connected, regardless of whether the system is installed on the HDD.
If the 100MB system boot partition and the system are installed on the SSD with mSATA interface, the SSD can boot normally without connecting the HDD.
Note: HDD here is a mechanical hard disk and SSD is a solid state hard disk.
I hope the above reply can help you.
If the above information can't solve your problem, you can log on to www.hp.com.cn/chat,, the online chat room of HP Network, and ask an online engineer to help you solve the problem further. More product information is available in www.hp.com.cn/800..